Mending this kind of damage takes time and effort. I do believe it can happen if, and only if, the two of you are deeply inclined to listen to each other and speak your mind. Don't bottle up anything that might be bothering you. Be transparent and require him to be transparent too, otherwise it won't get better and soon enough you'll be finding reasons to fight over petty things.

While it's not good to set a fixed time frame for things to work out, you should listen to your gut when it comes to measuring this progress, which is not linear, but should be steady. Be careful so you don't get trapped in a relationship where you're both hurting each other.

Be ready to the face lots of moments involving insecurity, needing lots of reassurance, jealousiness, feelings that you're giving more than you're taking.

(And I wish you the best. I've been where you are and worked it out. I see so many people, from the same age, in the same situation and they end up breaking up, which kind of disappointed me in that 'I'm lacking of references' way back then. I really hope things develop in the best way for you, whether you're able to keep the relationship or end up moving on)